"Database is garbage-collected" warning appearing very often

[joelnitta]

This is causing the windows build to fail:

 [ FAIL 18 | WARN 17 | SKIP 0 | PASS 76 ]
Error: Error: Test failures
In addition: Warning messages:
1: Database is garbage-collected, use dbDisconnect(con, shutdown=TRUE) or duckdb::duckdb_shutdown(drv) to avoid this. 
2: Database is garbage-collected, use dbDisconnect(con, shutdown=TRUE) or duckdb::duckdb_shutdown(drv) to avoid this. 
3: Database is garbage-collected, use dbDisconnect(con, shutdown=TRUE) or duckdb::duckdb_shutdown(drv) to avoid this. 
4: Database is garbage-collected, use dbDisconnect(con, shutdown=TRUE) or duckdb::duckdb_shutdown(drv) to avoid this. 
5: Database is garbage-collected, use dbDisconnect(con, shutdown=TRUE) or duckdb::duckdb_shutdown(drv) to avoid this. 
6: Database is garbage-collected, use dbDisconnect(con, shutdown=TRUE) or duckdb::duckdb_shutdown(drv) to avoid this. 
Execution halted

v 2.0.0